Recently, I have been trying to find a solution for powering the GH3. As most of you know I shoot my son’s climbing events. However, I recently took on a role where I have to actually record the entire event(About 8 hours).

The grip is way to extend battery time, and you can also use external batteries that connect via the DMW-DCC8 "DC Coupler" that comes with the GH3 AC adapter. Some of those last 8 hours or more - here's a video showing one of them running for 8 hours.